Shears



UNTTED STATES PATENT EEICE.

JAMES E. THURMOND, OF BILLINGS, MONTANA.

S H EA R S sPEcrEIcAiIoN forming part er Letters Patent No. 624,7()6, 'dated iviay 9, issie'` Application filed July 27, 1898. Serial No. 687,003. (,No model.)

T0 @ZZ whom it Wray concern:

Be it known that I, JAMES E. THURMOND, a citizen of the United States, residing at Billings, in the county of Yellowstone and State of Montana, have invented certain new and useful Improvements in Shears, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The main objects of my invention are to facilitate the grinding or sharpening and the renewal of the blades and to secure convenience and economy.

It consists, essentially, in providing shears having detachable blades, with cams or eccentrics for easily securing the blades to the handles, and in certain novel features of construction and combinations of parts, as hereinafter particularly described, and defined in the claims.

In the accompanying drawings like letters designate the same parts in the several iigures.

Figure l is a side elevation of a pair of sheep-shears embodying myinvention. Figs. -2 and 3 are detail views on an enlarged scale, showing the fasteningdevices for attaching the blades to the handles. Fig. l is a face view of a part of one of the blades to which the fastenings are applied. Fig. 5 is a section on the line 5 5, Fig. 3; and Fig. 6 is a perspective view of the tongue or projection on one of the handles for engaging the detachable blade.

For the purpose of illustration l have shown my invention as applied to sheep-shears; but it is applicable to other kinds of shears.

Referring to the drawings, and particularly to Fig. l, A A are the handles, which have the usual or any suitable form of spring connection at one end for separating or opening the blades when they are released. At the other end the handles are formed with plates or attened shanks c a for the attachment of the blades.

.B B are the blades, which are formed near the ends opposite their points with holes oropenings b and in their backs with undercut notches b as shown in Fig. 4.

C C are cams or eccentrics which are pivoted or journaled in the plates or shanks ct of the handles. To the outer ends of the spindies or journals of these cams or eccentrics are secured lever-arms D D. The plates or shanks otof the handles are formed, as shown in Fig. 6, with tongues orprojectionsa',which loosely fit into the notches or openings b in the blades. The cams or cccentrics C are formed on one side with beveled lips c, as

shown in Fig. 5, and they are adapted when the lips are turned forward 'with the leverarms D, as shown in Fig. 2, to pass freely into the holes b in the blades, these holes being enlarged or elongated for this purpose and beveled on one side, as shown in Figs. 4 and 5, so as to be engaged by the lips c of the cams or eccentrics when theyare turned back into the position shown in Figs. l and 3, and thus force and hold the blades backward and firmly against the faces of the plates a. The tongues a' and the notches b are also beveled on their engaging faces and are so located with reference to the eccentrics C and the holes b that when the eccentrics are turned backward, as shown in Fig.'3, the inclined or beveled edges of said notches will be drawn into engagement with the inclined faces of said tongues, thereby locking and holding the' blades firmly to and against the plates 'a at or near the backs of the blades and the ends of said'plates a.l The tongues c and the cams or eccentrics O terminate Hush with ora little short of the inner faces of the blades, as shown in Fig. '5, so as not to interfere with their closing.

The plates c are preferably formed on the outside next to the backs of the blades with ribs or shoulders a2, which overhang and shield the lever-arms D and also serve as stops therefor.

The several parts of the shears are made interchangeable, so that a single handle or pair of handles may be used with different blades and worn, broken, or defective blades can be easily replaced at a small cost. By means of the fastening devices shown and described the blades can be easily and quickly detached fromthe handles for grinding and sharpening them, and any number of blades can be packed in small compass and convenient form for carrying them. rlhe fastenings, being permanently attached to the handles and blades, cannot be misplaced and lost.

IOO

l do not wish to be understood as limiting 4 myself to the exact details of construction shown in the drawings, as they may be variously modied Within the spirit and intended scope of my invention.

I claiml l. Shears having the blades detachable from the handles, and provided With cams or eceentrics for fastening the blades to the handles, substantially as and for the purposes set forth.

2. Shears having handles provided with cams or eecentrics and with tongues or projections, and detachable blades having openings for the engagement of said cams and tongues, substantially as and for the purposes set forth.

3. Shears having handles provided with tongues or projections and with cams or ec centrics pivoted or journaled therein, and detachableblades having openings for the engagement of said cams and tongues, the engaging faces of said cams and tongues and of the openings in said handles being beveled or inc-lined to draw and hold the parts firmly together, substantially as and for the purposes set forth.

4. The combination in shears of the handles formed with flattened shanks or plates for the attachment of blades, and provided with cams or eecentr'ics which are pivoted or journaled in said plates and with tongues or projections, lever-arms for turning said cams and detachable blades formed With openings to receive said cams and tongues, substantially as and for the purposes set forth.

5. In shears the combination of handles the Shanks of which are provided With tongues or projections and with cams or eccentrcs piv; oted orjournaled therein and having lever; arms for turning them, and blades formed with openings in which said tongues and cams are loosely fitted, the engaging parts of said tongues, cams and blades being beveled or inclined to draw and hold them firmly to= gether when the cams are turned into locking position, substantially as and for the pur poses set forth. l

In Witness whereof I hereto affix mysignaL ture in presence of two witnesses.

JAMES E. THRMOND. Witnesses:

HENRY A. FRITH, HUGH P. BABoooK'. 

